Thermostat



FIG. 1 is a front elevation view of a thermostat showing the new design;

FIG. 2 is a front, top, and right side perspective view thereof, whereinthe opposite side perspective view is a mirror image;

FIG. 3 is a left side elevation view thereof; and,

FIG. 4 is a top plan view thereof; wherein the bottom plan view appearsthe same.

The broken lines shown in the drawings illustrate portions of thethermostat that from no part of the claimed design.

CLAIM The ornamental design for a thermostat, as shown and described.